期刊
APPLIED PHYSICS LETTERS
卷 98, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3570693
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资金
- AFOSR [FA9550-08-1-0104]
- DARPA [N66001-09-1-2112]
- DoD, AFOSR [32 CFR 168a]
We present the driven response at T=30 mK of 6 GHz superconducting resonators constructed from capacitively-shunted three-dimensional (3D) aluminum nanobridge superconducting quantum interference devices (nanoSQUIDs). We observe flux modulation of the resonant frequency in quantitative agreement with numerical calculation and characteristic of near-ideal short weak-link junctions. Under strong microwave excitation, we observe stable bifurcation in devices with coupled quality factor (Q) ranging from 30-3500. Near this bias point, parametric amplification with > 20 dB gain, 40 MHz bandwidth, and near quantum-limited noise performance is observed. Our results indicate that 3D nanobridge junctions are attractive circuit elements to realize quantum bits. (C) 2011 American Institute of Physics. [doi:10.1063/1.3570693]
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